xref: /aosp_15_r20/external/ot-br-posix/tests/gtest/test_once_callback.cpp (revision 4a64e381480ef79f0532b2421e44e6ee336b8e0d)

/*
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 *       names of its contributors may be used to endorse or promote products
 *       derived from this software without specific prior written permission.
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 *    THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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#include <gtest/gtest.h>

#include "common/callback.hpp"

TEST(IsNull, NullptrIsNull)
{
    otbr::OnceCallback<void(void)> noop = nullptr;

    EXPECT_TRUE(noop.IsNull());
}

TEST(IsNull, NonNullptrIsNotNull)
{
    otbr::OnceCallback<void(void)> noop = [](void) {};

    EXPECT_FALSE(noop.IsNull());
}

TEST(IsNull, IsNullAfterInvoking)
{
    otbr::OnceCallback<int(int)> square = [](int x) { return x * x; };

    std::move(square)(5);

    EXPECT_TRUE(square.IsNull());
}

TEST(VerifyInvocation, CallbackResultIsExpected)
{
    otbr::OnceCallback<int(int)> square = [](int x) { return x * x; };

    int ret = std::move(square)(5);

    EXPECT_EQ(ret, 25);
}